21228059 has 2 divisors, whose sum is σ = 21228060. Its totient is φ = 21228058.

The previous prime is 21228049. The next prime is 21228089. The reversal of 21228059 is 95082212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21228059 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21228049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10614029 + 10614030.

It is an arithmetic number, because the mean of its divisors is an integer number (10614030).

Almost surely, 2^21228059 is an apocalyptic number.

21228059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21228059 is an equidigital number, since it uses as much as digits as its factorization.

21228059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21228059 is about 4607.3917784360. The cubic root of 21228059 is about 276.8875500938.

The spelling of 21228059 in words is "twenty-one million, two hundred twenty-eight thousand, fifty-nine".